Snap In Instance Lists
If you have any snap in instance lists, they will now be running in Direct-X mode, so you should test carefully that your snap in instance lists still behave the way you want. Direct-X mode instance lists will look different and may behave differently.
In particular, in Direct-X the list's current item changes as the user moves the mouse over it, and the source fields of the list columns also change. Previously (Win32 mode) the current item changed only when the user clicked on an item.
Also check that your instance list resizes correctly. This can be a problem if your snap in list has W32 controls (including activeX and the List View) that are not directly sized by the parent object's layout manager.